Method for preparing nano chrome/vanadium carbide composite powder

A nano-chromium carbide and composite powder technology, which is applied in nanostructure manufacturing, nanotechnology, nanotechnology and other directions, can solve the problems of large particle size of chromium carbide powder, complicated process, can not meet the application of chromium carbide powder, etc., and achieves low impurity content, Simple process and rich raw materials

Inactive Publication Date: 2010-10-13
HENAN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem of this method is that the process is more complicated, and the particle size of the obtained chromium carbide powder is too large, which cannot meet the application of chromium carbide powder in modern industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]Take ammonium dichromate 4.20g, ammonium metavanadate 3.80g and nano carbon black 2.19g by weight, and they are placed in 50ml of deionized water, after stirring, a uniform mixed solution is obtained, and the mixed solution is placed in a dry place. box, heated at 100-200°C for 1-3h, then dried at 50-100°C for 1-5h, and finally obtained precursor powder containing chromium source, vanadium source and carbon source; the obtained precursor The powder is placed in a vacuum carbon tube furnace, and under vacuum conditions, it is carbonized and reduced at 800-1100° C. for 0.5-2 hours to obtain a nano-chromium carbide / vanadium composite powder with an average particle size of <100 nm and uniform particle size distribution (weight ratio 1:1).

Embodiment 2

[0031] Get ammonium dichromate 4.20g, ammonium metavanadate 7.60g and nanometer carbon black 3.51g by weight, place 50ml deionized water, obtain the mixed solution that mixes after stirring, mixed solution is placed in drying box, in Heating at 100-200°C for 1-3 hours, and then drying at 50-100°C for 1-5 hours to obtain a precursor powder containing chromium source, vanadium source and carbon source; place the obtained precursor powder in a tube In a type furnace, under the protective condition of argon or hydrogen atmosphere, carbonization and reduction are carried out at 800-1100°C for 0.5-2 hours to obtain nano-chromium carbide / vanadium composite powder with an average particle size of <100nm and uniform particle size distribution (weight ratio 1:2).

Embodiment 3

[0033] Take 4.20g of ammonium dichromate, 3.80g of ammonium metavanadate and 5.48g of glucose according to the weight ratio, put them in 50ml of deionized water, and stir to obtain a uniform solution. Heating under conditions for 1-3 hours, then drying at 50-100°C for 1-5 hours, and finally obtaining a precursor powder containing chromium source, vanadium source and carbon source; place the obtained precursor powder in a vacuum carbon tube furnace , under vacuum conditions, at 800-1000 ℃, 0.5-2h carbonization reduction, the average particle size <100nm, uniform particle size distribution of nano-chromium carbide / vanadium composite powder (weight ratio 1:1).

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Abstract

The invention discloses a method for preparing nano chrome / vanadium carbide composite powder. The preparation method comprises the following steps of: taking 4.20 to 10.90 grams of powdery chrome salt, 3.70 to 7.70 grams of ammonium vanadate and 2.20 to 8.40 grams of carbonaceous reducing agent in a weight ratio, putting the materials into deionized water or distilled water, and stirring the mixture uniformly to obtain solution or mixed liquid; putting the solution or the mixed liquid obtained in the step a into a drying oven, heating the solution or the mixed liquid for 1 to 3 hours at the temperature of between 100 and 200 DEG C, and drying the heated substance for 1 to 5 hours at the temperature of between 50 and 100 DEG C to finally obtain precursor powder containing chrome source, vanadium source and carbon source; and putting the precursor powder obtained in the step b into a high-temperature reaction furnace, and performing carbonization reduction on the precursor powder for 0.5 to 2 hours at the temperature of between 800 and 1,100 DEG C under the protection of vacuum, argon or hydrogen atmosphere to obtain the nano chrome / vanadium carbide composite powder with average grain diameter of less than 100 nanometers and uniform granularity distribution. The method has the characteristics of low reaction temperature, short reaction time, low production cost, simple process and the like, and is suitable for industrialized production of the nano chrome / vanadium carbide composite powder.

Description

technical field [0001] The invention provides a method for preparing nanometer chromium carbide / vanadium composite powder, which belongs to the field of nanometer metal carbide preparation. Background technique [0002] The transition metal carbide, chromium carbide (vanadium), has a high melting point, hardness and high temperature strength, as well as good electrical and thermal conductivity. These excellent properties ensure its wide application in metallurgy, electronics, catalysts and high-temperature coating materials. [0003] Among them, chromium carbide (vanadium) plays an important role as a grain inhibitor in the fields of cemented carbide and cermets. What is needed in industrial applications is chromium carbide (vanadium) powder with fine particle size and single phase composition. For example, when preparing ultra-fine cemented carbide, the particle size of WC powder should be less than 200nm, and high-pressure and low-temperature HIP sintering technology shou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82B3/00
Inventor 赵志伟郑红娟邹文俊王艳荣路朋献李彦涛
Owner HENAN UNIVERSITY OF TECHNOLOGY
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